摘要：
Problem Description MZL is a mysterious mathematician, and he proposed a mysterious function at his young age. Stilwell is very confused about this fu 阅读全文
摘要：
Problem Description A simple problem Problem Description You have a multiple set,and now there are three kinds of operations: 1 x : add number x to se 阅读全文
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Problem Description MZL loves xor very much.Now he gets an array A.The length of A is n.He wants to know the xor of all (Ai+Aj)(1≤i,j≤n) The xor of an 阅读全文
摘要：
Problem Description There is an integer a and n integers b1,…,bn. After selecting some numbers from b1,…,bn in any order, say c1,…,cr, we want to make 阅读全文